Synonyms|158Antonyms|0|Broader|3Narrower|14Related|41
22
virus(noun, illness, sickness, bug, plague)
18
microbe(noun, illness, sickness, bug, plague)
15
germ(noun, illness, unit, sickness, bug)
13
bacillus(noun, illness, sickness, germ, bacterium)
11
bug(noun, informal, illness, sickness, plague)
11
bacteria
9
pathogen(noun, germ, bacterium)
8
micro-organism
8
zoospore
7
microspore
7
paramecium
4
amoeba
4
bacterium(noun, unit, sickness, bug, plague)
4
dyad
4
protozoa
4
micro-
4
microbial
4
micrococcus
4
microphyte
3
animalcule
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ChicagoSmart Define. 2015. "microorganism thesaurus" https://smartdefine.org/microorganism/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, microorganism thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/microorganism/thesaurus/synonyms>.
MLASmart Define. "microorganism thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/microorganism/thesaurus/synonyms>